i have an expedition and i have 2 jl audio 12w3's and i need a box idea as i said i have an expedition and space is not a concern i want a ported box also.
JL recommends 1.75 per sub ported so that would be 3.5 cubes tuned to around 30-32 hz would be good. I would go with a rectangular box with a slot port that is 2.5 inches wide and 14 inches tall. Go here to figure out the rest